TW201518629A - Control valve - Google Patents

Abstract

A control valve, which is used to supply compressed air supplied from an air pressure source (11) to a supply-receiving member (12), performs slow start control on the supply of compressed air to the supply-receiving member (12). A valve housing (13) is provided with a primary-side port (14), a secondary-side port (15), and a communication hole (21). A valve shaft (24) is provided to a piston (23), and the valve shaft (24) has a fitting part (25) for closing off the communication hole (21) and a tapered part (26) for changing the degree of communication opening of the communication hole (21). The fitting part (25) closes the communication hole (21) when compressed air is not being supplied to the primary-side port (14), and the degree of communication opening of the communication hole (21) is increased by the tapered part (26) when compressed air is supplied to the primary-side port (14).

Description

Control valve

The present invention relates to a control valve that gradually increases a supply amount when compressed air is supplied to a member to be supplied.

In order to switch between the state in which the air ejected from the air pressure source is supplied to the member to be supplied via the flow path and the state in which the supply is stopped, the switching valve of the switching flow path is provided between the air pressure source and the member to be supplied. When the supply amount of the air to the member to be supplied is controlled, the speed control valve is provided in the pipe forming the flow path. By providing the speed control valve in the pipe, it is possible to supply air to the supplied member gradually increasing the air flow rate, and then supply the air of the maximum flow rate. However, when the speed control valve is provided in the piping, the pneumatic circuit tends to be complicated.

Patent Document 1 describes a control valve for controlling the driving of a piston rod by using a double-acting pneumatic cylinder in which a pressure chamber is provided on both sides of a piston as a member to be supplied. The control valve is disposed between the switching valve at the fifth and third positions and the pneumatic cylinder. When the piston rod of the pneumatic cylinder is protruded, the protruding speed is gradually increased, and the pneumatic cylinder is slowly started.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Unexamined Patent Publication No. SHO 53-31329

The control valve described in Patent Document 1 has a first switching position that restricts the communication opening degree between the inlet port and the outlet port, and a spool valve body that is connected to the second switching position in which the opening degree is fully opened. The compressed air is supplied to a pressure chamber, and when the piston rod is protruded, the spool body is set at the first switching position. The pressure at the first switching position is gradually increased by the compressed air, and the piston is gradually moved by the slow-starting of the inlet throttle control of the slightly limited opening. The control valve has a pilot piston for setting the spool body to the second switching position. When the switching valve supplies compressed air to the other pressure chamber, the spool body is set to the second switching position by the pilot piston.

Thus, when supplied to the other pressure chamber of the pneumatic cylinder, the control valve that can drive the pilot piston must be switched by the switching valve of the five-position three-position switch, although it can be applied to the case of driving the double-acting pneumatic cylinder. However, in the case where a pneumatic device such as a single-acting pneumatic cylinder or a nozzle for ejecting compressed air is used as a member to be supplied, it is not applicable.

It is an object of the present invention to provide a control valve that can supply compressed air to a supply member by slowly starting control by supplying and discharging air to the primary side.

The control valve of the present invention is a control valve that supplies compressed air supplied from a pneumatic source to a supply member, and the control valve has a valve chamber that is connected to a primary side of the air pressure source and is connected. a secondary side of the member to be supplied, and a communication hole that communicates the primary side with the secondary side, and a piston that is slidably inserted in the axial direction and coaxially disposed with the communication hole in the valve chamber a cylinder bore; the valve shaft is disposed in the piston, and the valve shaft includes: a fitting portion that locks the communication hole; and a tapered portion that changes a communication opening degree of the communication hole; and a valve shaft movement The control mechanism controls the movement of the valve axial direction to increase the communication opening degree when the compressed air is supplied to the primary side sill.

Cooperating in the communication hole connecting the primary side sill and the secondary side sill, and setting the cylinder hole to the valve In the room. The valve shaft provided on the piston inserted into the cylinder bore has a fitting portion that closes the communication hole and a tapered portion that changes the opening degree of the communication hole. Since the compressed air is not supplied to the primary side of the control valve, the communication hole is closed by the fitting portion. When the compressed air is supplied to the primary side, the valve shaft is driven, the tapered portion is moved to the position of the communication hole, and the opening degree of the communication hole is gradually increased. Thereby, when the compressed air from the air pressure source is supplied to the supplied member to start the supply, the compressed air is gradually supplied to the supplied member, and the supplied member is slowly started to be controlled. By switching the supply of the primary side weir and discharging the compressed air, it is possible to slowly start and control the supplied member without forming a complicated structure of the control valve.

10a-10h‧‧‧Control valve

11‧‧‧Air pressure source

12‧‧‧Supply components

13‧‧‧Valve room

14‧‧‧One side

15‧‧‧Secondary side

16‧‧‧One side flow path

17‧‧‧Secondary side flow path

18‧‧‧Installation holes

21‧‧‧Connected holes

22‧‧‧Cylinder bore

22a‧‧‧Connecting room

22b‧‧‧Valve shaft movement control room

23‧‧‧Piston

24‧‧‧ valve shaft

25,25a‧‧‧Mate

26, 26a‧‧‧ Tapered

27‧‧‧埠 Plug

28‧‧‧First stop surface

29‧‧‧ Sealing member

30, 30a‧‧‧ Sealing members

30b, 30c‧‧‧ Sealing members

31, 31a‧‧ ‧ spring components

32‧‧‧second stop surface

33‧‧‧Closed plug

34‧‧‧Switching valve

35‧‧‧ lead 埠

36‧‧‧leading flow path

37‧‧‧ throttle valve

38‧‧‧ bypass flow path

39‧‧‧check valve

41‧‧‧Sleeve

42‧‧‧Locking valve

43‧‧‧One side end face

44‧‧‧ Sealing members

45‧‧‧ needle seat components

46‧‧‧through holes

47‧‧‧ orifice

48‧‧‧needle valve shaft

49‧‧‧needle

51‧‧‧End cap

52‧‧‧ Male screw department

53‧‧‧Lock nuts

54‧‧‧End cap

55‧‧‧ orifice

56‧‧‧second side end face

57‧‧‧ Sealing members

Fig. 1 is a cross-sectional view showing the control valve of the first embodiment.

Fig. 2 is a cross-sectional view showing the control valve of the second embodiment.

Fig. 3 is a cross-sectional view showing the control valve of the third embodiment.

Figure 4 is a cross-sectional view showing the control valve of the fourth embodiment.

Fig. 5 is a cross-sectional view showing the control valve of the fifth embodiment.

Figure 6 is a cross-sectional view showing the control valve of the sixth embodiment.

Figure 7 is a cross-sectional view showing the control valve of the seventh embodiment.

Figure 8 is a cross-sectional view showing the control valve of the eighth embodiment.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In the respective embodiments, the same symbols are denoted on members having the same function.

As shown in Fig. 1, the control valve 10a is used to supply compressed air supplied from the air pressure source 11 to the member to be supplied 12. For example, the supplied member 12 is a pneumatic cylinder or an air nozzle. Wait for a pneumatic machine. When the supplied member is a pneumatic cylinder, the compressed air is supplied to the pressure chamber when the piston rod is protruded, the single-acting pneumatic cylinder that the piston rod can return by the spring, or the double-acting pneumatic pressure without the spring Cylinder.

The control valve 10a has a valve chamber 13 composed of a square metal member. In valve chamber 13 A side sill 14 and a secondary side sill 15 are provided. The primary side sill 14 is open to one side of the valve chamber 13 and is connected to the air pressure source 11 by the primary side flow path 16. The secondary side weir 15 is opened on the other side of the valve chamber 13, and is connected to the member to be supplied 12 by the secondary side flow path 17. A mounting hole 18 having a step extending in the lower direction of the first drawing is formed in the valve chamber 13. The primary side sill 14 and the secondary side sill 15 are respectively communicated with the mounting hole 18. The primary side weir 14 is formed on one end side of the valve chamber 13, and the secondary side weir 15 is formed at a position spaced upward from the primary side weir 14.

One of the mounting holes 18 is a communication hole 21 having a small inner diameter, and the primary side 14 and the secondary side The crucible 15 communicates via the communication hole 21. The other end side of the mounting hole 18 on the upper side in the first drawing is a cylinder bore 22 having an inner diameter larger than the communication hole 21, and the cylinder bore 22 is coaxial with the communication hole 21. A piston 23 is inserted into the cylinder bore 22, and a valve shaft 24 is provided on the piston 23. The fitting portion 25 of the lock communication hole 21 is provided at the front end portion of the valve shaft 24, and the tapered portion 26 of the connection fitting portion 25 is provided on the proximal end side of the valve shaft 24.

A cylindrical plug 27 is attached to the upper end portion of the mounting hole 18. Piston 23 axis direction The return movement is between the restricted retracted position against the plug 27 and the restricted forward position provided on the first stop surface 28 of the valve chamber 13. The cylinder bore 22 is partitioned by a piston 23 into a communication chamber 22a on the front side of the piston 23 and a valve shaft movement control chamber 22b on the rear side. The sealing member 29 is mounted on the piston 23, and the communication chamber 22a and the valve shaft movement control chamber 22b are sealed by a sealing member 29, and the sliding resistance is applied to the piston 23 by the sealing member 29. Further, the sealing member 30 is mounted on the plug 27. In order to apply a spring force in the backward direction to the piston 23, the spring member 31 is attached to the outside of the valve shaft 24. The spring force in the reverse direction is applied to the valve shaft 24 by the spring member 31. The valve shaft 24 is fitted to the communication hole 21 toward the fitting portion 25 by the spring force in the reverse direction, and the position of the communication hole 21 is closed. The spring member 31 is a compression coil spring, and one end of the spring member 31 abuts against the front surface of the piston 23, and the other end of the spring member 31 abuts against the second end formed in the valve chamber 13. Moving surface 32. The lower end of the mounting hole 18 is closed by the blocking plug 33.

The solenoid valve (ie, the switching valve 34) is disposed on the primary side flow path 16, and the switching valve 34 is located at the secondary gas The compressed air supplied from the pressure source 11 is supplied to the primary side flange 14 and the two positions where the supply is stopped. The guide 35 is connected to the valve shaft movement control chamber 22b before the plug 27. The leading flow path 36 is provided between the leading dam 35 and the primary side flow path 16, and the compressed air supplied to the primary side cymbal 14 is supplied to the leading rim 35 by the leading flow path 36. When the compressed air is supplied to the leading ram 35, the thrust in the forward direction against the spring force is applied to the piston 23.

The direction in which the piston 23 faces the primary side weir 14 is set to the forward direction of the piston 23, and the phase is The reverse direction is set to the reverse direction. The fitting portion 25 that locks the communication hole 21 is provided at the front end portion of the valve shaft 24. When the fitting portion 25 closes the communication hole 21, the communication hole 21 is in the fully closed state. A tapered portion 26 connected to the fitting portion 25 is provided on the proximal end side of the valve shaft 24, and the outer diameter of the tapered portion 26 gradually decreases from the fitting portion 25 toward the piston 23. When the piston 23 is driven in the forward direction and the tapered portion 26 reaches the position of the communication hole 21, the communication opening degree of the communication hole 21 changes depending on the position of the valve shaft 24. The throttle valve 37, which can set the flow rate in advance, is provided in the pilot flow path 36, and the flow rate of the compressed air supplied to the valve shaft movement control chamber 22b via the pilot port 35 is set to be smaller than the compressed air supplied to the primary side weir 14. The bypass flow path 38 is connected to the front flow path 36, and the check valve 39 is provided on the bypass flow path 38. The check valve 39 prevents air from flowing from the air pressure source 11 toward the front guide port 35, while allowing the flow in the reverse direction.

The spring force in the reverse direction is biased by the spring member 31 to the piston 23. Forward direction The thrust is applied to the piston 23 by the compressed air supplied from the pilot flow path 36 to the valve shaft movement control chamber 22b. When the compressed air is not supplied to the primary side weir 14, the valve shaft 24 is driven in the reverse direction by the spring force, and the fitting portion 25 closes the communication hole 21. When the compressed air is supplied to the primary side weir 14, the valve shaft 24 is driven in a direction in which the opening degree of the communication hole 21 is increased by the tapered portion 26. The valve shaft 24 is driven in the forward direction by the compressed air to increase the communication opening degree between the tapered portion 26 and the communication hole 21.

In Fig. 1, the switching valve 34 is in a position to close the primary side flow path 16. Because in this state Next, the piston 23 is in the restricted retracted position by the spring force of the spring member 31, and the communication hole 21 is provided by the valve shaft 24 The fitting portion 25 is closed. In this state, when the switching valve 34 is switched and the air pressure source 11 communicates with the primary side weir 14 and the leading weir 35, the compressed air is gradually supplied to the valve shaft movement control chamber 22b via the throttle valve 37 and the leading weir 35. Thereby, the piston 23 and the valve shaft 24 are gradually driven forward against the spring force. At this time, the sliding resistance is slightly applied to the piston 23 by the sealing member 29. When the valve shaft 24 is driven forward, the fitting portion 25 is separated from the communication hole 21, and the tapered portion 26 is at the position of the communication hole 21. Since the diameter of the base end side of the tapered portion 26 is small, as the valve shaft 24 moves forward, the opening degree of the communication hole 21, in other words, the communication opening degree of the primary side turn 14 and the secondary side turn 15 is gradually increased. Big. Therefore, when the switching valve 34 is switched to activate the member to be supplied 12, the flow rate of the compressed air supplied to the member to be supplied 12 is gradually increased. Thereby, the supplied member 12 is controlled to be slowly started by the control valve 10a.

In Fig. 1, the state in which the valve shaft 24 is in the restricted forward position is shown by a broken line, and the valve shaft 24 is in the When the forward position is restricted, the communication opening degree of the communication hole 21 is fully opened. Thereby, the compressed air supplied to the member 12 is supplied with a constant flow rate, and the supply member 12 is driven. The timing of the transition from the slow start control to the dosing control is adjusted by the throttle of the throttle valve 37. As shown in Fig. 1, when the control valve 10a switches the supply and discharge of air to the primary side weir 14 by the switching valve 34, the control unit 10a supplies the compressed air to the supplied member 12 by the slow start control.

For example, in the case where the supplied member 12 is a pneumatic cylinder, at the time of slow start control, pressure The flow of the reduced air is gradually increased while driving the piston, and when it is converted to the dosing control, the piston is driven at a constant speed. The piston stops when the piston is driven to the position of the stroke end. Further, in the case where the supplied member 12 is an air nozzle, when the start-up control is performed slowly, the flow rate of the air ejected from the air nozzle gradually increases, and when the quantitative supply control is changed, a certain amount of air is ejected from the air nozzle.

In the control valve 10b shown in Fig. 2, a resin sleeve 41 is provided in the cylinder bore 22. The piston 23 is inserted into the sleeve 41 and slidably guided by the sleeve 41 in the axial direction. In the control valve 10a shown in Fig. 1, the piston 23 and the sealing member 29 are in sliding contact with the metal surface. On the other hand, as shown in FIG. 2, when the sleeve 41 is formed of a resin such as a fluororesin, the piston 23 and the sealing member 29 are in sliding contact with the resin surface. because As a result, the slidability of the piston 23 and the sealing member 29 is improved as compared with the control valve 10a shown in Fig. 1 . In the air pressure circuit using the control valve 10a shown in Fig. 1, the slidability of the piston 23 or the like is increased, and the oil component is mixed into the compressed air supplied from the air pressure source 11. On the other hand, as shown in Fig. 2, when the piston 23 slides on the resin sleeve 41, the oil component is not mixed in the compressed air, and the valve chamber 13 does not need to be made of resin, so that the piston 23 can be smoothly operated.

In the control valve 10c shown in Fig. 3, a shut-off type blocking valve having a larger diameter than the fitting portion 25 42 is provided at the front end portion of the valve shaft 24. When the valve shaft 24 moves backward, the lock valve 42 abuts against the primary end surface 43 of the communication hole 21 to seal the communication hole 21. A sealing member 44 is provided on the opposite surface of the lock valve 42 opposed to the primary side end surface 43. The sealing member 44 may be attached to the primary side end surface 43.

In order to slide the fitting portion 25 in the communication hole 21, the fitting portion 25 and the communication hole 21 are required. Set a little gap. Therefore, in the control valve 10a shown in Fig. 1 and the control valve 10b shown in Fig. 2, even if the fitting portion 25 closes the communication hole 21, a part of the air supplied to the primary side weir 14 will still be present. A little flow from the communication hole 21 toward the secondary side turn 15 . On the other hand, in the control valve 10c shown in Fig. 3, when the valve shaft 24 is in the retracted position, the communication hole 21 is sealed, and no air flows in the communication hole 21.

In the control valve 10d shown in Fig. 4, the variable throttle valve 37 is inserted into the valve chamber 13. A needle seat member 45 having a stepped cylindrical shape is mounted in the mounting hole 18 formed in the valve chamber 13. When the piston 23 abuts against the hub member 45, the piston 23 is in the restricted retracted position. A leading ram 35 is formed in the valve chamber 13. A through hole 46 communicating with the leading rim 35 is formed in a cylindrical portion of the hub member 45. The compressed air supplied to the leading ram 35 is guided to the valve shaft movement control chamber 22b on the rear end side of the piston 23 by the through hole 46. The orifice 47 is formed at the front end of the hub member 45. The orifice 47 extends in the axial direction so that the through hole 46 communicates with the chamber on the upper side of the piston 23.

The needle valve shaft 48 is movably disposed in the hub member 45 in the axial direction. Needle 49 is provided on the needle The front end portion of the valve shaft 48. The needle portion 49 is inclined so as to have a smaller outer diameter toward the distal end. Make the axis of the needle 49 When the position is changed, the opening degree of the orifice 47 is adjusted. Thereby, the flow rate of the compressed air supplied to the valve shaft movement control chamber 22b and biasing the piston 23 in the forward direction is adjusted.

A cylindrical end cap 51 is fixed to the end of the mounting hole 18. a male screw provided on the needle valve shaft 48 The wire portion 52 is coupled to the female screw of the end cap 51. When the needle valve shaft 48 is rotated, the flow rate of the air flowing between the needle portion 49 and the orifice 47 is adjusted. The locking nut 53 is coupled to the protruding end of the male screw portion 52. When the lock nut 53 is fastened to the end cap 51, the rotation of the needle valve shaft 48 is controlled. As described above, when the throttle valve 37 is inserted into the valve chamber 13, unlike the above case, it is not necessary to provide the throttle valve 37 in the pilot flow path 36. The sealing member 30a, 30b is sealed between the hub member 45 and the mounting hole 18, and is sealed between the needle shaft 48 and the hub member 45 by the sealing member 30c.

Fig. 5 shows a control valve 10e according to a modification of the control valve 10d shown in Fig. 4. Figure 4 In the control valve 10d shown, the leading flow path 36 is provided outside the valve chamber 13, and in the control valve 10e shown in Fig. 5, the leading flow path 36 is provided in the valve chamber 13. The leading port 35 provided in the valve chamber 13 communicating with the cylinder bore 22 communicates with the primary side weir 14 via the leading flow path 36.

Fig. 6 shows a control valve 10f according to a modification of the control valve 10a shown in Fig. 1. The control The above-described spring member 31 is not provided in the valve 10f. The control valve 10f shown in Fig. 6 operates as follows. When the compressed air is supplied to the primary side, when the valve shaft 24 is at the lower limit of the figure, the piston 23 is biased upward by the compressed air introduced into the communication chamber 22a. Therefore, the piston 23 and the fitting portion 25 are immediately moved to the upper limit position in the drawing. Thereby, after the compressed air is supplied to the primary side weir 14, since the compressed air does not directly flow out to the secondary side weir 15, the slow start is ensured.

The control valves 10a-10f shown in Figs. 1 to 6 belong to the adjustment by the throttle valve 37. The type of primary side compressed air flow to which the thrust is applied to the plug 23 is the inlet throttle control. Each of the throttle valves 37 serves as a mechanism for controlling the movement of the valve shaft.

The control valve 10g shown in Fig. 7 is provided on one end side of the mounting hole 18 of the valve chamber 13 For the primary side sill 14, the primary side sill 14, the communication hole 21 and the cylinder bore 22 are coaxial. Secondary side 埠15 compared to one The secondary side weir 14 is provided on the other end side of the valve chamber 13, and the primary side weir 14 and the secondary side weir 15 communicate with each other via the communication hole 21.

The primary side sill 14 is connected to the air pressure source 11 by the primary side flow path 16, and the switching valve 34 is provided at The primary side flow path 16 is on. The secondary side weir 15 is connected to the member to be supplied 12 by the secondary side flow path 17. As shown in Fig. 6, the primary side sill 14 is open at the lower end surface of the valve chamber 13, but as shown in Figs. 1 to 5, the primary side sill 14 can be opened on the side of the valve chamber 13. Further, in the control valves shown in Figs. 1 to 4, the primary side weir 14 may be opened at the lower end surface of the valve chamber 13.

The spring member 31a is attached to the valve shaft movement control chamber 22b which is fixed between the end cap 54 and the piston 23 at the end of the mounting hole 18. The spring member 31a applies a spring force in the forward direction to the piston 23. The spring member 31a compresses the coil spring, and one end abuts against the end cap 54 and the other end abuts against the piston 23. The tapered portion 26a is provided at the front end portion of the valve shaft 24 provided on the piston 23, and the fitting portion 25a is provided on the proximal end side of the valve shaft 24. When the piston 23 and the valve shaft 24 are positioned at the restricted forward position by the spring force, the fitting portion 25a closes the communication hole 21.

The tapered portion 26a is inclined such that the outer diameter gradually decreases from the fitting portion 25a toward the front end of the valve shaft 24, and protrudes toward the primary side weir 14. Therefore, when the compressed air is supplied to the primary side weir 14, and the pressure on the primary side is applied to the valve shaft 24, the valve shaft 24 is driven together with the piston 23 in the backward direction. Thereby, the degree of communication between the tapered portion 26a and the communication hole 21 changes depending on the length in which the valve shaft 24 moves in the backward direction.

When the piston 23 moves backward, the throttle hole 55 is provided in the end cap 54 in order to throttle the external air from the valve shaft movement control chamber 22b. The orifice 55 guides the outside air into the valve shaft movement control chamber 22b when the piston 23 moves forward. Thus, the throttle valve 37 is constituted by the end cap 54 having the orifice 55. The throttle valve 37 may be constructed such that a large diameter hole is provided in the end cap 54, and the throttle valve 37 and the check valve 39 are provided in a flow path communicating with the large diameter hole. In this case, the throttle valve 37 restricts the flow rate when the air flows from the valve shaft movement control chamber 22b to the outside, and the check valve 39 blocks the air flow when the air flows from the valve shaft movement control chamber 22b to the outside, and allows the air to flow. Flow in the opposite direction.

The sealing member 57 is disposed on the valve shaft 24, and the sealing member 57 is at the restricted forward position of the valve shaft 24. At the time, it abuts against the secondary side end face 56 of the communication hole 21. When the sealing member 57 abuts against the secondary side end surface 56, the communication hole 21 is sealed. The sealing member 57 may be attached to the secondary side end surface 56, and the step portion against the sealing member 57 may be provided on the valve shaft 24.

In the control valve 10h shown in Fig. 8, similarly to the control valve 10b shown in Fig. 2, A resin sleeve 41 is provided in the cylinder bore 22. The piston 23 is inserted into the sleeve 41 and slidably guided by the sleeve 41 in the axial direction. When the piston 23 is slid on the resin sleeve 41, as described above, the oil component is not mixed in the compressed air, and the valve chamber 13 does not need to be made of a resin, so that the piston 23 can be smoothly operated.

As shown in Figs. 7 and 8, the end cap 54 is provided with an orifice 55 having a small inner diameter. Piston 23 When moving backward, the air discharged from the valve shaft movement control chamber 22b via the orifice 55 is throttled by the orifice 55. In other words, the control valves 10g, 10h become the outlet throttle type control. In the case where the orifice 55 is not provided in the end cap 54, the supply discharge pipe is connected to the communication hole provided in the end cap 54, and a throttle valve is provided in the supply discharge pipe.

As described above, the control valve of the present invention, when supplying compressed air to the primary side sill, At the beginning of the supply start, the flow rate of the compressed air supplied to the supplied member 12 is gradually increased. By providing a switching valve that switches the state in which the primary side is supplied with the compressed air and the state in which the supply is stopped, between the control valve and the air pressure source, the supply member 12 can be slowly started and controlled by the control valve having a simple configuration.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit and scope of the invention.

[Industrial Availability]

The control valve of the present invention can be utilized in a pneumatic circuit for supplying air ejected from a pneumatic source to a member to be supplied.

10a‧‧‧Control valve

11‧‧‧Air pressure source

12‧‧‧Supply components

13‧‧‧Valve room

14‧‧‧One side

15‧‧‧Secondary side

16‧‧‧One side flow path

17‧‧‧Secondary side flow path

18‧‧‧Installation holes

21‧‧‧Connected holes

22‧‧‧Cylinder bore

22a‧‧‧Connecting room

22b‧‧‧Valve shaft movement control room

23‧‧‧Piston

24‧‧‧ valve shaft

25‧‧‧Mate

26‧‧‧Cone

27‧‧‧埠 Plug

28‧‧‧First stop surface

29‧‧‧ Sealing member

30‧‧‧ Sealing members

31‧‧‧Spring components

32‧‧‧second stop surface

33‧‧‧Closed plug

34‧‧‧Switching valve

35‧‧‧ lead 埠

36‧‧‧leading flow path

37‧‧‧ throttle valve

38‧‧‧ bypass flow path

39‧‧‧check valve

Claims (8)

A control valve is a control valve that supplies compressed air supplied from a pneumatic source to a supply member, and the control valve has a valve chamber that is connected to a primary side of the air pressure source and is connected to the foregoing a secondary side of the member to be supplied, and a communication hole for connecting the primary side to the secondary side; the piston is slidably inserted into the cylinder coaxially with the communication hole in the valve chamber in the axial direction a valve shaft that is provided in the piston, and the valve shaft includes: a fitting portion that locks the communication hole; and a tapered portion that changes a communication opening degree of the communication hole; and a valve shaft movement control mechanism When the compressed air is supplied to the primary side sill, the valve axial direction is controlled to increase the direction of the communication opening. The control valve according to claim 1, wherein the valve shaft movement control mechanism is configured such that when the fitting portion moves from the position where the communication hole is blocked, the tapered portion changes the communication opening degree of the communication hole. At the position of the throttle valve that controls the speed of movement of the aforementioned piston. The control valve according to claim 2, wherein the fitting portion is provided at a front end portion of the valve shaft; the tapered portion is coupled to the fitting portion, and the outer diameter gradually decreases toward the piston. The method is provided on the base end side of the valve shaft, and is connected to the primary side turn, and the throttle valve is provided in a pilot flow path that applies a thrust force in a forward direction to the piston. The control valve according to claim 2, wherein the front flow path is connected to the guide before the valve chamber is provided, and the throttle valve is fed from the air pressure source toward the air of the front guide flow. The control valve according to claim 2, wherein the front flow path is connected to the guide before the valve chamber is disposed, and the throttle valve is disposed between the front guide and the piston. The control valve according to claim 2, wherein the valve shaft is moved backwards to resist A latching valve of the primary end surface of the communication hole is provided at a front end of the valve shaft. The control valve according to claim 1, wherein a resin sleeve that guides the piston in a sliding direction in the axial direction is provided in the cylinder bore. The control valve according to claim 1, wherein the tapered portion is provided at a front end portion of the valve shaft so as to have an outer diameter that gradually decreases toward the front end portion, and the fitting portion is coupled to the tapered portion. The portion is provided on the base end side of the valve shaft.